21621404634630 has 32 divisors (see below), whose sum is σ = 52088676735744. Its totient is φ = 5743785056736.

The previous prime is 21621404634617. The next prime is 21621404634637. The reversal of 21621404634630 is 3643640412612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621404634637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1370169844 + ... + 1370185623.

It is an arithmetic number, because the mean of its divisors is an integer number (1627771147992).

Almost surely, 2^{21621404634630} is an apocalyptic number.

21621404634630 is an abundant number, since it is smaller than the sum of its proper divisors (30467272101114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21621404634630 is a wasteful number, since it uses less digits than its factorization.

21621404634630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740355740.

The product of its (nonzero) digits is 497664, while the sum is 42.

The spelling of 21621404634630 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred four million, six hundred thirty-four thousand, six hundred thirty".